Gravel or ore screen.



F. J. HOYT.

GBAVEL 0R -ORB SCREEN. APPLICATION FILED JULY 7, 190s.`

ZZorzetg.

l fr@ ven/Zar F. J. HOYT. GRAVEL 0R ORE SCREEN. APPLICATION FILED JULY7, 1908.

Patented Mar. 7, 1911.V

3 SHEETS-SHEET 2.

fawn for feia'a J5@ THE NoRRls PETERS co.. WASHINGTON. D. c.

F. J. HOYT.

GRAVEL 0B. ORE SCREEN. APPLICATION FILED JULY 7, 1903A 985,809. PatentedMar. 7, 1911.

3 SHEETS-SHEET 3.

1mi mmms Psftns co., wAsmNaroN. D. c,

FREDERICK J'. HOYT, OF' REDLANDS, CALIFORNIA.

GRAVEL OR ORE SCREEN.

esasoe.

To uli' 'whom it may concern:

Be it known that l, Fminnmox J. lilorr, of the city of Redlands, in thecounty of San Bernardino and State of California, have inventedImprovements in Gravel or Ore Screens, of which the following is a full,clear, and exact specification, reference being had to the annexeddrawings and to the letters and ligures marked thereon.

My invention pertains to the construction of gravel or ore screens, inwhich the gravel or ore is separated in the order of their sizes, and itprovides a frame having thereon horizontallydisposed,transverselymovable endless screens which are carried by rollers, andthe rollers have grooves to receive sprocket chains to carry thescreens, so that the screens may be kept taut by suitable means, as willnow be set forth in detail.

ln the annexed drawing, Figure 1 is a side elevation of my improvedgravel or ore screen, showing three screens in operative relationship.Fig'. 2, is an end elevation corresponding to Fig 1, looked at in thedirection of the arrow X, Fig. 1. Fig. 3, is a plan corresponding toFigs. 1, and 2, and hereinafter described.

Upon the annexed drawings the parts marked 1, constitute the framingwherein the screens and the driving` gear for operating the rollers andsprocket chains and traveling screens are carried. In the lower part ofthis framing and carried in bearings 2, is the shaft 3. The shaft 3, isdriven by a belt acting upon the driving pulley 4. Upon the shaft 3,there are carried three belt driving pulleys 5, 6, and 7, respectively,all of the same diameter, and these driving pulleys actuate the drivingbelts 8, 9, and 10, whose upper ends pass over corresponding pulleysupon the screen driving shafts 11, 12, and 13. Upon the driving shafts11, 12, and 13, as shown at Figs. 2, and 3, but more especially at Fig.2, and as near the ends of the shafts 11, 12, and 13, as may beconveniently arranged within the framing 1, is a driving sprocket wheel14, upon each of said shafts. These driving sprocket wheels 14, engagewith the driving sprocket chains 15, more especially shown in Fig. 8,and positive motion is thereby transmitted from each of the sprocketwheels 14, to the tension rollers 16, and grooved idler carrying wheels17, by the continuous motion of the Specification of Letters latent.

Application filed July l', 1908.

Fatented Mar. '7, 1911.

serial no. 442,615.

sprocket chains in operating in the grooves or channels in each of thetension rollers and in each of the idler carrying rollers.

The sluiee 1S, is that from which the mixed gravel and sand, or mixedgravel or ore with water, flows on to the flat upper part of the firstscreen 19, and as this flat part of the upper screen 19, travels in thedirection indicated by the arrows in Figs. 2, and 3, it necessarilyfollows that while permitting of the liner material and .water drippingthrough the meshes of the upper flat part of the screen 19, that thecoarser portions of the gravel or ore which cannot pass through themeshes of the screen 19, are delivered over the end of the screen as itpasses around the sprocket wheels 14. This coarser or firstseparatedgravel or ore. then falls, as shown at Fig. 2, on to the chute 20, andthence is discharged on to the traveling belt 21, by which it isdeposited into receptaeles, railway cars, or other vehicles, all of thesame grade or size.

rlhe water and the portions of the gravel or ore which pass through themeshes of the screen 19, fall downward as indicated in Fig. 2, upon thesecond screen 32, which also is moved by its sprocket wheel 14, operatedfrom the driving shaft. 3, as hereinbefore described, and discharges thenext coarsest graded portions of the gravel or ore over the screen atthe end where the driving sprocket wheel 14, and shaft 12, are situated,and these graded portions of the gravel or ore fall over that part ofthe screenat this end of the machine into the chute 23, from which theyare discharged on to the traveling belt 24, and deposited whereverrequired as hereinbefore described with reference to the traveling beltl21. Such further portions of gravel or ore mixed with water which aresmall enough to pass through the meshes of the screen 22, are depositedupon the top flat portion of the screen 25, and are discharged over theend of the screen where it is driven by the three driving sprocketwheels 14, and is discharged into the chute 26, thence on to thetraveling belt 27, from which it. is discharged as hereinbeforedescribed.

1t is here explained that while in the previous part of thisspecification, consisting of the description of some parts of thedrawings, the driving sprocket wheels-14, upon the shafts 11, 12, and13, are referred to as that hy which motion is positively transferredfrom the belt pulleys to the several screens, yet there are rollers orcylinders, and other grooved wheels and sprocket chains between thedriving' end of the several shafts 11, 12, and 13, and the opposite endof said shafts, where carried in the bearings attached to the framing 1.These other grooved wheels 17, are shown in dotted lines within thescreen 19, in the upper part ot Fig. 1, rEhey are also particularlyshown in plan in Fig. while in the second screening mechanism next belowthe screen 19, in Fig. 1, these greoved wheels 17, together with theshafts which they are carried on7 are shown in elevation, being alsoshown in elevation as part ot' the mechanism of the third screen in Fig.1.

Between the driving sprocket wheel 11i, of each series of sprocket andgrooved wheels 30, there are carried cylindrical rollers 31, 32, and 33,shown in elevation in Fig. 1, with the screen removed in respect of thesecond and third members of the series, and in plan in Fig. 3. rl'heobject of these intermediate rollers 31, 32, and 33, is to providesullicient transverse traveling bearing surface across the width ot' thescreens, each otl which is placed in the condition of tension bvtightening the tension gear 311, of each 'oit' the tension rollerscarried upon the shafts 35, 36, and 37, the tightening produced hy whichdraws each screen taut over the corresponding cylinders 31, 32, and 33,carried upon each of the shafts 11, 12, 13, 35, 36, and 37, as well asupon the outer end shafts 17a of each series.

Any convenient means may be used for tightening the tension of thesha-tts 35, 36, and 37, and the grooved wheels carried thereon, but haveshown upon the annexed drawings a bracket piece 38, in the upper part ofeach of which is a bearing for one end of the shafts 35, 36, and 37, ofthe tension rollers. A

The water and ne sand admiXed therewith, after passing through the lastand lowest screen of a series of screens, is discharged by the chute 39,into the bin 40, and deposited therein.

It will be understood from the preceding description of the mechanismconstituting my present invention, that the several sprocket chains inaddition to the driving sprocket chain for each screen, as well as thegrooved idlers 17, upon the tension shafts 35, 3G, and 37, are providedfor the purpose of maintaining each screen fiat, that is to say, withoutbellying, and that for the purpose of more eilectually insuring this,the screen is fastened by soldering or by an equivalent fastening at oneor more parts of its length, to each of the sprocket chains. Theparticular mode of fastening the screens to the sprocket chains doesnot, however, constitute any part ot' my present invention.

l claim as my invention.

A. gravel or ore screen, comprising a frame having thereinhorizontally-disposed, transversely-inovable endless screen, cylindersor rollers at each end to carry said screen, said rollers having`grooves at intervals and sprocket chains in said grooves extending fromroller to roller, the screens being secured to said chains at intervals,and means for producing tension on said chains and keeping' said screentaut.

ln testimony whereof, I have hereunto set my hand and seal at the cityof Los Angeles, in the presence of two subscribing witnesses.

FREDERICK J. HOYT. [L s] 1V itnesses ST. JOHN DAY,

J. D. Gear.

Copies of this patent :nay be obtained, for five cents each, byaddressing the Commissioner of latents, Washington, D. C.

